RE: Re: GPS + Pulsars + an apology/rebuttal

Roger Books 
> > Who is going to put in beacons that will only be good
> > after the signal gets across some large number of
> > (light) years?

Katy: 
> Erm. Us?
> 
> We have sent out messages that are unlikely to be read inside the next
> 50,000  years. Sometimes people can be long-term about things...

Roger:
>That was a short term relatively inexpensive publicity stunt.	The
costs to put out something that will have enough power to be a 
"space GPS" in normal space requires a huge investment that will 
come into affect after the builders and politicians have retired.

Might want to change that to "may require" and "might not come into
effect"--kind of hard to be sure whether it'll be economical in 150+
years.
  If we put in a beacon at a number of stars, they'll be usable after
just a few years--how many years depends on how many stars, of course.

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